To make it easy for you go with your original plan and just drill a hole about the size of a half dollar right by the sub on the bottom and if you want a bit more add the PVC pipe. I looked at the speakers your using I was going a bit overboard. Sorry. And yes keep the speakers facing outward. BTW the cone? is that the port? If so to big.
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:DI like it when things go !BOOM!:D
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